Table A.1.

Number of selected AGN candidates per criteria.

Data Diagnostic EDF-N EDF-S EDF-F
18< IE≤21 21< IE≤22 22< IE≤24.5 18< IE≤21 21< IE≤22 22< IE≤24.5 18< IE≤21 21< IE≤22 22< IE≤24.5
Photometry PRFa 138 1882 44 429 161 2838 37 869 59 1476 17 694
B24A 1085 2038 12 146 1210 2113 13 155 480 886 4690
B24B 658 997 8178 ... ... ... ... ... ...
C75 1106 2081 10 888 2149 3379 17 031 1278 1639 7561
R90 498 196 405 792 347 690 399 204 579
GDR3-QSOs 606 35 3 769 42 0 442 68 0
JH_IEY 1084 1789 15 599 1244 2369 18 236 509 980 6888
IEH_gz 591 909 6802 787 1247 9340 400 611 4323

Total 2547 6474 80 184 3410 8505 80 390 1697 3995 34 854

Spectroscopyb SPECTYPE: QSO 400 484 673 ... ... ... ... ... ...
Broad-line QSO 366 460 603 ... ... ... ... ... ...
Broad-line Galaxy 57 48 113 ... ... ... ... ... ...
NII BPT 93 1 1 ... ... ... ... ... ...
SII BPT 69 0 5 ... ... ... ... ... ...
OI BPT 72 3 38 ... ... ... ... ... ...
WHAN 1792 12 14 ... ... ... ... ... ...
Blue 104 47 103 ... ... ... ... ... ...
KEX 188 110 467 ... ... ... ... ... ...

Total 2250 636 1350 ... ... ... ... ... ...

Other Q1 selections X-raysc 62 72 210 625 425 609 447 520 1973
Diffusion modelsd 1831 2078 1326 3435 2678 1609 1400 1012 571
Deep learninge 494 2813 12 779 650 3361 15 043 232 1464 6721

Total 2303 4566 13 700 4179 5691 16 169 1759 2471 7325

SED fitting AGN fractionf 2172 1218 4166 ... ... ... ... ... ...

Notes. (a)PRF selected QSOs: Euclid Collaboration: Tucci et al. (2026). (b)All Spectroscopic diagnostics rely on the DESI CTPs and their corresponding SPECTYPE labelling. (c)X-ray selected AGN candidates: Euclid Collaboration: Roster et al. (2026). (d)AGN candidates from diffusion models trained on VIS data: Euclid Collaboration: Stevens et al. (2026). (e)AGN candidates from deep learning trained on IllustrisTNG: Euclid Collaboration: Margalef-Bentabol et al. (2026). (f)AGN candidates from AGN fraction threshold: Euclid Collaboration: Laloux et al., in prep.

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